feat: Non-zero Default Fees (backport #9371)

[mergify]

This is an automatic backport of pull request #9371 done by Mergify.
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Changes to be committed:
	modified:   docs/run-node/run-node.md
	modified:   server/config/config.go
	modified:   server/start.go
	modified:   testutil/network/util.go
	modified:   types/errors/errors.go

Unmerged paths:
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	both modified:   CHANGELOG.md
	deleted by us:   contrib/rosetta/node/data.tar.gz
	both modified:   docs/core/cli.md
	both modified:   server/util_test.go
	both modified:   simapp/simd/cmd/root.go

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[amaury1093]

Not sure if we really want this for 0.42. If yes, we should probably also backport #9550 too, or think of an alternate solution for chain developers to set a default min gas price.

I'm closing this for now, can re-open if there's strong will to have this in v0.42